Tire sealant injector

ABSTRACT

The invention relates to a device for injecting tire sealant fluid into a tire. The present invention uses a syringe type reservoir connected to a long, flexible tube which is in turn connected to a valve stem connector. The valve stem connector has two different threads, Schrader and Presta, to accommodate both types of valve stems. The Schrader type threads are larger than the Presta type threads and thus the Presta type threads are positioned further into the valve stem connector of the present invention than the Schrader type threads. The larger, Schrader type threads are used on automobiles and less expensive bicycles. The Presta threads are more common in Europe and are used on most high-performance bicycles. The main advantages of the present invention are that an exact amount of sealant can be dispensed, there is no wasted sealant because spillage is eliminated and the device uses no external power source to dispense the sealant. The tire sealant injector can be used on bicycles, utility vehicles, ATVs, lawn and garden tractors, wheelbarrows, golf carts and even automobiles.

FIELD OF THE INVENTION

The invention relates to a syringe type injector for dispensing tire puncture sealant into a tire. The invention is used to both seal a tire puncture and also to help prevent future tire punctures and leaks.

BACKGROUND OF THE INVENTION

The present invention solves many problems that face any type of tire repair as it relates to punctures and leaks. Originally he field of bicycling was the primary field of use for the present invention. It was determined that a variety of other applications includes also well within the scope of the present invention. Other applications could include: ATV's, utility vehicles, lawn and garden tractors, wheelbarrows, golf carts and automobiles but are not limited to those listed. The invention grew out a need for a simple, more accurate and less messy way of injecting puncture sealant into a tire which has either lost its air or has otherwise become unable to hold the air which is put into it. A further development of the invention came when it was found that there are two types of valve stems in conventional bicycle tires. The Schrader type of valve stem is of a larger diameter and has a different set of threads than its smaller Presta counterpart. The present invention has a connector which can accommodate both the Schrader and Presta valve stem arrangements without the need for changing or adapting the end of the unit. The tire sealant of the present invention was designed with the everyday user, such as a homeowner or casual biking enthusiast in mind. The device is capable of larger, commercial applications as well.

The prior art known consists mainly of either an aerosol type of injector system or a device which needs to be hooked up to an external power source to provide the injecting means for depositing the sealant into the tire. Both have deficiencies that the present invention does not. The present invention forms a leak-free connection with the valve stem regardless of the type of stem encountered. Traditional ways of injecting sealant into tires creates a messy situation as excess sealant runs down the valve stem and requires extensive clean up. Virtually all of the sealant used with the present invention is deposited into the tire and thus none is wasted. This waste causes money to be lost and additional time is spent cleaning up after use. The present invention has neither of these problems. The second main advantage of the present invention is one of simplicity. The tire sealant injector of the present invention does not rely on any external power source, such as a pump, to dispense the fluid. This is not only costly to do but also has to be done in the vicinity of electric power which may or may not always be available. The tire sealant injector of the present invention is an improvement over the manual squeeze bottle type which is known in the art. The squeeze bottle method has the major drawback of having to wait for the air refill the reservoir after the first squeeze. Hand fatigue is a major problem with the squeeze bottle type of dispenser since it takes several pumps to inject enough sealant into the tire. This can be very time consuming as a set of four tires can take up to 45 minutes to 1 hour to fix. Four tires can be sealed in less than 15 minutes with the tire sealant injector of the present invention.

The present invention allows for a controlled, measured amount of sealant to be injected into the tire with out the mess and waste of the conventional systems known today. The U.S. Pat. No. 5,908,145 to Jaksa show a typical system for injecting sealing fluid into a tire which includes a valve stem connector, reservoir chamber and a flexible hose connecting the two. Jaksa also shows a set of fittings which connect to a source of compressed air or pump to inject the sealant into the tire. The invention of Jaksa is both more costly than the present invention and relies on an outside agent (compressed air from a pump or compressor) to inject the sealing fluid into the tire. This is a typical construction for many of the prior art documents in this field. It should also be pointed out that the device of Jaksa makes no provision for servicing both Schrader and Presta type valve stems. The U.S. Pat. No. 5,012,954 to Will shows a tire inflation system using a compressed gas to fill a tire with air. Will does not make any attempt to fix a puncture but rather a way of inflating a brand new tube when positioned within a tire. The only significant thing in this patent is that an adapter is used to accommodate both Schrader and Presta type valve stems.

OBJECTS OF THE INVENTION

It is an object of the present invention to provide a simple, efficient and cost effective device for injecting tire sealant into a tire.

It is another object of the present invention to provide a way of sealing a puncture in a tire without wasting tire sealant and also providing a way to measure and control the amount of sealant being injected into the tire.

It is a further object of the invention to allow for all skill levels of user to effectively use the invention and not to have to rely upon external sources for successful completion of the sealant insertion.

SUMMARY OF THE INVENTION

The following description comprises an improved mechanism for injecting tire sealant into a punctured or leaking tire. The injection of fluid can be preventative as well as to fix a flat tire. It will become necessary, from time to time to add sealant to the tire for preventative maintenance. The device of the present invention makes this addition of sealant quick and easy. The present invention is concerned with injecting the fluid into the tire only. The tire must then be filled with air by any known conventional way such as, a manual pump or the like. While bicycle tires are to be mentioned heavily for the purpose of demonstration, the present invention is in no way limited to bicycles. The present invention can easily be used with ATVs, utility vehicles, lawn and garden tractors, wheelbarrows, golf carts and even automobiles. The present invention was for use primarily with tubeless tires but can also be quite effective in the repair of tires with tubes.

The present invention consists of a syringe type chamber with a plunger type dispensing apparatus connected to a flexible tube at one end and on the other end of the flexible tube is a valve stem connector. The details of all the elements and the combination of the elements will be described later. One key element of the invention is the ability to adapt to both Schrader and Presta type valve stems without changing or manipulating the device. Another key element of the invention is that the injector is a very accurate way of injecting a known and controlled amount of sealant into a tire. The shortcoming of the known aerosol type or “fix a flat” type of devices is that there is no way of knowing how much of the solution is inside the tire. It is usually recommended that the entire contents of the container be used. This is entirely too much for a bicycle tire or wheelbarrow tire. These aerosol type of dispensers were designed for automobiles or trucks. The present invention is versatile enough to work on virtually any type of tire.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will be made to the accompanying drawings wherein like numerals refer to like parts throughout and in which:

FIG. 1 shows the present invention in its full form.

FIG. 2 shows a detailed view of the valve stem connector piece or the device of FIG. 1.

FIG. 3 shows a cross-sectional view of the valve stem connector piece of FIG. 2 to show both the Schrader and Presta type of thread configurations.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIG. 1, the elements shown are arranged in a preferred form. Sealant reservoir 1 has a plunger mechanism 2 positioned within its chamber. The plunger mechanism is shown to have a ring type end 7 but it should be stated that any type of end can be used. The outer walls of the sealant reservoir 1 have level indicator markings 6 so as to aid in achieving the proper filling level depending upon the size and style of the tire to be filled. The sealant reservoir 1 is that of a syringe type whereas the outer syringe forms the reservoir and the plunger mechanism 2 acts to both draw the sealant from its container and to expel the sealant through the hose connector 3 positioned at the sealant reservoir end. Connected to the hose connector 3 is a flexible hose or tubing 4. It is preferable that the tubing 4 is clear so as to make sure all the sealant has been dispensed but the tubing 4 can be opaque. While size, shape and color are not critical to the functioning of the sealant injector, making at least the sealant reservoir 1 and the tubing 4 out of clear plastic would be beneficial. The cross sectional shape of the sealant reservoir 1 can be round, square, hexagonal or any other shape as long as the plunger mechanism 2 can be of similar shape and form a seal with the sides of the reservoir 1. Located at the distal end of the tubing 4 is a valve stem connector 5 which is shown in greater detail in FIG. 2 and FIG. 3.

Turning now to FIG. 2, the valve stem connector 5 is of round cross section and has a knurled portion 8 along a portion of its exterior. This knurled portion 8 is to allow for the user to grip the valve stem connector 5 when it is being attached to a valve stem. The valve stem connector 5 has one end of greater diameter than the other. The knurled portion 8 is shown on the end with the greater diameter. The smaller diameter end or tubing connector end 9 has a barbed end area 10 to positively engage the tubing 4 when it is positioned over the tubing connector end 9. In FIG. 3, the valve stem connector 5 is shown in cross sectional view so as to see that there is a bore 11 completely through the valve stem connector 5. Also shown in FIG. 3 are the two types of threads, the Schrader thread 12 being the one that is larger in diameter and the Presta thread 13 which is the smaller of the two threads. It is seen that both the threads are axially aligned and concentric with each other. The valve stem connector can be made of plastic, aluminum or any other suitable material which can handle threading. Plastic is the most cost effective material and is the material of choice for both cost effectiveness, weight and durability.

In use, first the valve core must be removed from the valve stem. This removal can be done by any of a number of conventional means and thus will not be discussed further. It should be pointed out at this point that the tire sealant injector of the present invention can be used with the tire being either mounted on the vehicle or separated from the vehicle. The valve stem of the tire can also be in any position, even at the top of the tire. Once the valve core has been removed, the valve stem connector end 5 of the present invention is positioned within a container of sealant. Next the plunger mechanism 2 is drawn outward from the sealant reservoir 1 to draw the sealant into the chamber of the sealant reservoir 1. The level indicator markings 6 can be used to determine when enough sealant has been drawn to complete the tire sealing process. This amount is directly proportional to the size of the tire being worked on. Once the desired amount of sealant is within the chamber of the sealant reservoir 1, valve stem connector 5 is positioned over the core-less valve stem until either the Schrader thread 12 or Presta thread 13 becomes engaged. The valve stem connector 5 is then screwed onto the valve stem until snug. Now you can depress the plunger mechanism 2 to expel the sealant into the tire through the valve stem. Once the sealant is completely expelled, the valve stem connector 5 is unscrewed and removed and the valve core can be re-inserted. The sealant filled tire should then be rotated a few times to completely coat the inside of the treated area. Finally, the tire can be re-inflated to the proper pressure and the tire sealant injector can be cleaned and stored for later use. 

1. A tire sealant injector for injecting sealant into a tire, the tire sealant injector comprising: a sealant reservoir having a chamber for receiving tire sealant, said chamber having an inside and an outside surface, said chamber having an axial length; a plunger means positioned within said chamber and moveable along the axial length of said chamber to form a seal with the inside surface of said chamber; a tubing connector positioned at one end of said chamber; a length of tubing having a first and second end, said first end being attached to said tubing connector; a valve stem connector having a length, said valve stem connector having an internal bore through said length, said internal bore having a first set of female threads and a second set of female threads located within said internal bore, said first set of threads being Schrader threads and said second set of threads being Presta threads; whereby tire sealant is dispensed through said tubing connector, tubing and valve stem connector into a tire through a valve stem when said plunger means is depressed.
 2. The tire sealant injector of claim 1, wherein said Schrader threads are located at an outer most end of the internal bore of said valve stem connector and said Presta threads are located further inside said internal bore of said valve stem connector.
 3. The tire sealant injector of claim 1, wherein said outside surface of said chamber has graduation markings on said outside surface to aid in determining the amount of tire sealant in the chamber.
 4. The tire sealant injector of claim 1, wherein said valve stem connector has a knurled outer portion to provide a gripping surface to a user.
 5. The tire sealant injector of claim 1, wherein said plunger means has a plunger ring positioned at an outer surface of said plunger means to provide an area for gripping when filling the chamber and expelling the sealant into the tire.
 6. The tire sealant injector of claim 1, wherein said valve stem connector has a barbed end to receive said second end of said tubing to more positively attach said tubing to said valve stem connector. 